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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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<body>
    <script>
        var num = 12.34343;
        function go(){
            show();
        }
        function show(){
            console.log("1")
        }
        go()
        /* age=50 */
        var obj = [{name:"zhang",age:18},{name:"li",age:17}]
        obj.forEach(item=>{
            item.age = 50;
        })
        console.log(obj)
        console.log(num.toFixed(2))
    </script>
</body>
</html>